Pet Peeves

The way I see it, after driving in 20 Mardi Gras parades, I've got a right to bitch

Urbanspoon has compiled a list of peoples pet peeves when eating out. My biggest pet peeve is simply being ignored. My wife and I have walked out of restaurants because we were just left sitting there. Your pet peeve may be something different...

Don't you hate it when...  Doesn't it just make you crazy when...  Don't you wish they'd stop...  Okay, so pet peeves aren't the worst things in the world, but don't they just annoy the fire out of you?  What are your biggest peeves?